Ingenuity sprouting from the rooftops
The rooftops of Manhattan are as varied as the city itself. A glance at the city skyline reveals a myriad of shapes and colors. Look a little closer and the shapes reveal themselves to be the things we often see rooted on Manhattan buildings, such as water towers, ventilation systems and communications equipment. But, on a few rooftops, something else is taking root--literally.
For this and more Science Nation, go to http://www.nsf.gov/news/special_reports/science_nation/index.jsp